package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1 校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2 不符合 返回
            return Result.fail("手机格式不正确！");
        }

        //3 符合 生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4 保存验证码到Redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5 发送验证码
        log.info("发送验证码：{}" + code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1 校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机格式不正确！");
        }
        //2 校验验证码
        String code = loginForm.getCode();
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if(cacheCode == null || !cacheCode.equals(code)){
            return Result.fail("校验码错误！");
        }
        //3 根据手机号查询用户是否存在
        User user = query().eq("phone", phone).one();
        if(user == null){
            //4 不存在创建用户
            user = createUserWithPhone(phone);
        }

        //5 存在保存到Redis
        //5.1 生成随机令牌
        String token = UUID.randomUUID().toString();
        //5.2 将对象转为hash
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> (fieldValue.toString())));
        //5.3 保存到redis
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        // 设置有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);

    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
